气候变化领域集成服务门户(CCPortal): Geochemical characterization of ophiolites in the Alpine-Himalayan Orogenic Belt: Magmatically and tectonically diverse evolution of the Mesozoic Neotethyan oceanic crust

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DOI	10.1016/j.earscirev.2020.103258
	Geochemical characterization of ophiolites in the Alpine-Himalayan Orogenic Belt: Magmatically and tectonically diverse evolution of the Mesozoic Neotethyan oceanic crust
	Furnes H.; Dilek Y.; Zhao G.; Safonova I.; Santosh M.
发表日期	2020
ISSN	0012-8653
卷号	208
英文摘要	Ophiolites are important archives of oceanic crust development and preservation in the rock record, and the Alpine-Himalayan Orogenic Belt (AHOB) is one of the most comprehensive ophiolite depositories in earth's history. We have compiled published data on the field occurrences and geochemistry from 137 AHOB ophiolites, ranging in age from Triassic through Cretaceous, in order to characterize the nature of the Mesozoic Neotethyan oceanic crust. We have used in this synthesis our recent ophiolite classification approach and applied the most effective geochemical discrimination diagrams to categorize the Neotethyan ophiolites within the AHOB. The subduction-related, Backarc (BA), Forearc (FA), Backarc to Forearc (BA-FA) and Volcanic Arc (VA) ophiolites exhibit different geochemical features, with the BA and FA types defining the end-members with low-high and high subduction influence, respectively. The subduction-related ophiolites constitute 76% of the ophiolite record in the AHOB, with the BA type ophiolites being the most dominant group (43%), followed by the BA-FA (19%) and with FA and VA types as subordinate groups (8% and 6%, respectively). The subduction-unrelated ophiolites, making up 24% of the AHOB ophiolite archive, include Mid-Ocean Ridge (MOR), Continental Margin, and Plume type ophiolites. The MOR type comprises 19% of this total and is the dominant type in the western part of the AHOB. Both major ophiolite categories are commonly associated with tholeiitic to alkaline ocean island basalt (OIB) associations, which represent the remnants of plume-proximal magmatism in different Neotethyan seaways. Subduction-unrelated ophiolites in the westernmost end of the Neotethyan realm were derived from downgoing oceanic plates, and were involved in high-pressure, subduction zone metamorphism prior to their exhumation along the suture zones. Subduction-related ophiolites, derived from the upper plates at Neotethyan convergent margins, escaped such high-pressure metamorphism and extreme fragmentation during their emplacement. Therefore, their complete Penrose ophiolite stratigraphy with greenschist facies metamorphic overprint is commonly well preserved in the collision zones of the AHOB. Different subduction contributions (from zero to 100% in the MOR and FA, respectively) may attest to variable slab dip angles and fluctuations in slab-induced elements and sediments into the mantle melt source of ophiolite–forming magmas. © 2020 The Author(s)
英文关键词	Alpine-Himalayan orogenic belt; Geochemical discrimination of oceanic lavas; Mantle melt source; Mesozoic Neotethyan ophiolites; Mid-ocean ridges; Suprasubduction zone magmatism
语种	英语
scopus关键词	igneous geochemistry; magmatism; mantle source; Mesozoic; mid-ocean ridge; oceanic crust; ophiolite; tectonic evolution; tectonic setting; Tethys; Alps; Himalayas
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209582
作者单位	Department of Earth Science, University of Bergen, Allegt. 41, Bergen, 5007, Norway; Department of Geology & Env. Earth Science, Miami University, Oxford, OH 45056, United States; Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong; Sobolev Institute of Geology and Mineralogy, 3 Koptyuga ave., Novosibirsk, 630090, Russian Federation; Novosibirsk State University, 1 Pirogova St., Novosibirsk, 630090, Russian Federation; School of Earth Science and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing, 100083, China; Department of Earth Science, University of Adelaide, Adelaide, SA 5005, Australia
推荐引用方式 GB/T 7714	Furnes H.,Dilek Y.,Zhao G.,et al. Geochemical characterization of ophiolites in the Alpine-Himalayan Orogenic Belt: Magmatically and tectonically diverse evolution of the Mesozoic Neotethyan oceanic crust[J],2020,208.
APA	Furnes H.,Dilek Y.,Zhao G.,Safonova I.,&Santosh M..(2020).Geochemical characterization of ophiolites in the Alpine-Himalayan Orogenic Belt: Magmatically and tectonically diverse evolution of the Mesozoic Neotethyan oceanic crust.EARTH-SCIENCE REVIEWS,208.
MLA	Furnes H.,et al."Geochemical characterization of ophiolites in the Alpine-Himalayan Orogenic Belt: Magmatically and tectonically diverse evolution of the Mesozoic Neotethyan oceanic crust".EARTH-SCIENCE REVIEWS 208(2020).